Why? Because in March, Topeka Mayor Bill Bunten announced that he was informally changing the name of his town to "Google," just for one month. He told CNN that he was doing it for "fun." This is Google's tit-for-tat explanation, according to its official blog, posted by CEO Eric Schmidt.

"Whatever the outcome, the conclusion is clear: we aren't in Google anymore," blogs Schmidt.

April Fool's Day carries a long tradition for pranks and punks, which affect every aspect of life, from the school yard to the board room. Since the advent of the Internet, companies and individuals have gotten inundated with funky e-mails making wild claims, on this day in particular.